We have CA PPM(Clarity) 13.3. The Database we are using is Standard edition of SQL server 2008 R2. We are planning to upgrade to 14.2, but in the release notes its mentioned SQL server 2008 R2 Enterprise Edition as supported version

In the current infrastructure we don't have Enterprise edition. So have anyone upgraded to 14.2 version using the SQL server 2008 Standard/Developer edition ?

We at CA Support do not recommend you to go with an unsupported database. In fact when you run your 14.2 upgrade the checkinstall part of the upgrade(the part that checks the requirements in the beginning) will fail on unsupported database version. Any way to get this to work will have to involve unsupported modification of the files. We would encourage you to get the Enterprise edition as this is the one we actually tested and certified with PPM.

The checkinstall should fail on any Standard edition, and would issue a warning for Developer edition, that is correct. I thought you were on Standard edition by your post description. It is still unfortunately unsupported to use.